Top o’ the mornin’ to ya, gov’nor. David Morrissey’s charismatic “big bad” of season three—part Atticus Finch, part Saddam Hussein—has reshaped the dynamics of AMC’s The Walking Dead, as Rick Grimes (Andrew Lincoln) and company (minus two more of the original crew, who are dropping like flies) now battle for survival against not just the relentless titular flesh-eating zombies, but also fellow human survivors. (So much for the spirit of brotherhood articulated by Jesse Eisenberg in Ruben Fleischer’s 2009 film: “We all are orphans in Zombieland.”) After a dark and brooding sophomore season, the series—based on Robert Kirkman’s graphic novels—has been redirected and adrenaline-rushed, without sacrificing any of the compelling character drama and profound moral quandaries that have elevated it to the highest reaches of genre TV.